In the aftermath of the Tuesday's attack at the Manchester Arena, British Prime Minister Theresa May has announced that the terror threat level in the country has been raised from "severe" to "critical", which is the highest level meaning that the threat of further attacks looms large on the country.

An independent body which sets the threat level recommended it be raised to "critical" from "severe" for the first time since June 2007.

"The work undertaken throughout the day has revealed that it is a possibility we can not ignore that there is a wider group of individuals linked to this attack", May said.

"The priority remains to establish whether he was acting alone or as part of a network", Hopkins said.

"You might also see military personnel deployed at certain events such as concerts and sports matches, helping the police to keep the public safe", she said.

It is the latest in a series of deadly incidents across Europe claimed by IS jihadists that have coincided with an offensive on IS redoubts in Syria and Iraq carried out by US, British and other Western forces.

Martin Reardon, a security analyst and former Federal Bureau of Investigation agent, said that as ISIL loses ground in the Middle East, fighters are likely to stage more attacks in Europe.The bombing also came in the lead-up to a June 8 general election in the UK.

Mumbai:Ariana Grande returned to the United States on Tuesday, one day after a suicide bomberkilled 22 people at the singer's concert in Manchester, England, as questions lingered over whether she would continue her European tour.

Witnesses described the horror when the bomber blew himself up outside one of the exits as the mostly youthful audience was leaving, with many parents waiting outside to collect their children.

Jones told AFP that he was "shocked" and "surprised" when he heard that the suspect was from there.

Labour's Mike Gapes, who hopes to return to Parliament in the Ilford South seat, said: "We must not allow murderous terrorists to undermine our democratic society".

Police promised extra measures at showpiece events coming up such as Saturday's FA Cup football final. Campaigning for the Jun 8 election, which opinion polls suggest May's Conservative Party is on track to win, has been suspended as a mark of respect.

Mrs May spoke to Mr Corbyn in the hours after the bomb attack which killed 22 in Manchester, and agreed to put the contest on hold until further notice.

Roughly 21,000 people were packed into the Manchester arena Monday night.

US President Donald Trump gestures as he delivers an address at the Israel Museum in Jerusalem. Also killed was 8-year-old Saffie Roussos, who a teacher called "simply a handsome little girl in every aspect of the word" who was warm, kind, "and unassuming, with a creative flair". Greater Manchester Police says the blast killed at least 19 people, and the ambulance service says 59 people have been taken to hospitals.